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I-insulated flexible Aluminium air duct yenziwe yi-tube yangaphakathi, i-insulation kunye nejacket. 1. Ityhubhu yangaphakathi: yenziwe ngebhanti yefoyile enye okanye ezimbini, ezithe jizeke ngokujikeleza ngocingo oluphezulu olulastiki; I-foil inokuthi yenziwe nge-laminated Aluminium foil, i-aluminised PET ifilimu okanye ifilimu ye-PET. NONEFunda ngokugqithisileyo»